Algebraic Number TheoryThis is a corrected printing of the second edition of Lang's well-known textbook. It covers all of the basic material of classical algebraic number theory, giving the student the background necessary for the study of further topics in algebraic number theory, such as cyclotomic fields, or modular forms. Part I introduces some of the basic ideas of the theory: number fields, ideal classes, ideles and adeles, and zeta functions. It also contains a version of a Riemann-Roch theorem in number fields, proved by Lang in the very first version of the book in the sixties. This version can now be seen as a precursor of Arakelov theory. Part II covers class field theory, and Part III is devoted to analytic methods, including an exposition of Tate's thesis, the Brauer-Siegel theorem, and Weil's explicit formulas. The second edition contains corrections, as well as several additions to the previous edition, and the last chapter on explicit formulas has been rewritten. |
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a₁ abelian extension adele archimedean absolute values Artin map assertion assume automorphism bounded Chapter character class field theory coefficients compact complex numbers compute concludes the proof contained converges Corollary cyclic decomposition group define denote Dirichlet series discriminant embedded equal Euclidean exists factor group finite extension finite number follows formula Fourier transform fractional ideal functional equation fundamental domain Galois extension Galois group given group G Hence homomorphism ideal class group idele induced inequality integral closure isomorphism kernel L-series lattice Lemma Let f Let K/k M-divisor maximal ideal mod q multiplicative group non-zero notation number field number of elements obtain open subgroup p-adic positive integer prime ideal prime number Proposition quasi-character quotient r₁ ramified Re(s reciprocity law ring roots of unity satisfying sinē splits completely subset surjective trivial unit unramified variables vector whence write zeta function